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BeoMaster 4400

Beomaster 4400 was an advanced high-fidelity FM receiver which represented significant refinements in the design of domestic sound equipment. It incorporated a number of technical innovations and highly creative circuit designs which would not be out of place in a professional unit. In terms of technical finesse and power output, Beomaster 4400 was Bang & Olufsen’s top of the line stereo receiver in 1979 – 80.

The amplifier’s rated output of 75 watts RMS per channel (into 4 ohm speakers) provided more than enough power even in large rooms. There were DIN sockets for connecting a record-player, two tape or cassette recorders (one socket allowed monitoring), headphones and two pairs of stereo speakers. One pair of speaker outputs could be switched to ambiophonic use. In addition to the more usual controls and adjustment facilities, Beomaster 4400 had switchable high and low filters, a loudness control for physiologically compensated output at low volume settings and a linear function which caused the signal to by-pass all tone and filter circuits for truly unadulterated output. An overload indicator was provided to show when the amplifier’s limit for undistorted sound had been reached. Transient Intermodulation Distortion (also called transistor sound) was reduced substantially thanks to carefully designed circuits upon special research at Bang & Olufsen.

Receivers and amplifiers with the ambio function were products which, apart from stereo, could also reproduce the ambience or sound information of a room. Ambient information was included on most stereo vinyl recordings but could not be reproduced by a sound system with two loudspeakers or an ordinary stereo amplifier. Bang & Olufsen systems with the ambio function had facilities which electronically subtracted the difference signal (i.e. the difference between left and right channels) which contained ambient information. This information was fed into two extra loudspeakers which were placed as side speakers in a room. Ambiophony was an extension of stereo reproduction and enhanced the sense of realism. It could be used with nearly all stereo programme materials

The tuner was extremely sensitive and had low distortion levels over the entire FM waveband. Naturally, it incorporated all the latest technical and scientific advances such as a symmetrical Quadrature detector with the Phase Locked Loop stereo decoder which guaranteed low distortion and long-term channel separation on FM stereo programmes. The AFC (Automatic Frequency Control) circuit had characteristics which reduced inter-station noise during tuning. This circuit was also triggered automatically to eliminate loud ‘switch’ noise when changing between radio, record or tape programmes. There were six small dials for pre-tuning FM radio stations, so subsequent programme selection was just a matter of pressing a switch.

Beomaster 4400 could be made up as part of the Beosystem 4400, when linked together with other compatible Bang & Olufsen products.

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BeoVision 6000

BeoVision 6000

Beovision 6000 was a luxurious colour TV receiver with a 66cm screen and cordless, ultrasonic remote control (designed by David Lewis).

The slim remote control module allowed you to select up to eight TV programmes, adjust volume, brightness and colour strength from the correct viewing and listening position. You could also switch the set off without moving away from your armchair. The ‘recall’ facility provided a digital on-screen display indicating the channel currently being viewed. The reset function automatically returned volume, colour and brightness to pre-set levels.

Beovision 6000 was the first TV with dedicated remote control. Successor to the Beovision 3000 (1967) which was Bang & Olufsen’s first colour TV. The design of the TV set itself was by Henning Moldenhawer.

Picture quality was outstanding, with sharp, bright, precise image definition and natural colours. The automatic cut-off circuit monitored the balance of colours fifty times a second, guaranteeing long-term colour truth.

Sound reproduction was of hi-fi quality because Beovision 6000 was fitted with a 6,5 watts RMS amplifier which had a wide frequency range and less than 0,8% harmonic distortion. The loudspeaker was of a pressure-chamber construction as used in many hi-fi audio systems. There were separate controls for bass and treble and sockets for connecting headphones and additional speakers. The receiver could also be equipped with a module for Teletext reception and video cassette programmes could be reproduced without additional technical adjustment.

Beovision 6000’s genuine wood-finished cabinet had a unique tambour screen door for protecting the screen when the set was not in use. The self-styled wooden undercarriage with smooth-running castors was both practical and elegant.

Beovision 6000 was replaced by Beovision 6002 in 1977, again with the same stylish cabinet and sliding, tambour door.

Henning Moldenhawer (Beomaster 900 designer) once dubbed the concept of remote control Terminals as “feel commanders”. This meant that the product could be operated by the thumb on one hand – almost as if the user was feeling his way through a new type of Braille, allowing the eye to concentrate on the TV picture itself.

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BeoVision 6002

BeoVision 6002

Beovision 6002 was a luxurious colour TV receiver with a 66cm (viewable) screen and cordless, ultrasonic remote control. The slim remote control module allowed you to select up to eight TV programmes, adjust volume, brightness and colour strength from the correct viewing and listening position. You could also switch the set off without moving away from your armchair. The ‘recall’ facility provided a digital on-screen display indicating the channel currently being viewed. The reset function automatically returned volume, colour and brightness to pre-set levels.

Picture quality was outstanding, with sharp, bright, precise image definition and natural colours. The automatic cut-off circuit monitored the balance of colours fifty times a second, guaranteeing long-term colour truth.

Sound reproduction was of hi-fi quality because Beovision 6002 was fitted with a 6,5 watts RMS amplifier which had a wide frequency range and less than 0,8% harmonic distortion. The loudspeaker was of a pressure-chamber construction as used in many hi-fi audio systems. There were separate controls for bass and treble and sockets for connecting headphones and additional speakers. The receiver could also be equipped with a module for Teletext reception and video cassette programmes could be reproduced without additional technical adjustment.

Beovision 6002’s genuine wood-finished cabinet had a unique tambour screen door for protecting the screen when the set was not in use. The self-styled wooden undercarriage with smooth-running castors was both practical and elegant.

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BeoVision 601

BeoVision 601

The Beovision 601 was visually very similar to the Beovision 600, but it used a mildly redesigned chassis. The changes centred mostly around the receiver section, which made greater use of integrated circuits that the previous model had done.

The Beovision 601 was the last true Bang & Olufsen portable television, in as much as it was designed and produced by them in Denmark. It would be the late 1980’s before another portable model would appear, which was the disappointing MX 1500, a Philips set made in a Philips factory in Italy.

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BeoVision 4002

BeoVision 4002

Beovision 4002 and 4402 were colour receivers with 26″ screens. Natural colours, sharp, precise image definition and high-fidelity sound reproduction are all features you can take for granted, according to the 1970 – 80 Bang & Olufsen product catalogue. Their high reliability levels were due to modular construction techniques and low heat-generation. Beovision 4002 consumed only 110 watts – less than a black and white set of years previously.

Both sets were extremely easy to use. There were facilities for presetting up to eight stations so that subsequent programme selection was just a matter of pressing one button. This turned the set on at the same time.

Beovision 4402 had the additional convenience of a cordless (ultrasonic) remote control. The set could also be supplied equipped for Teletext reception. There was automatic synchronisation of VCR programmes on all channels.

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BeoVision 4402

BeoVision 4402

Beovision 4002 and 4402 were colour receivers with 26″ screens. Natural colours, sharp, precise image definition and high-fidelity sound reproduction are all features you can take for granted, according to the 1970 – 80 Bang & Olufsen product catalogue. Their high reliability levels were due to modular construction techniques and low heat-generation. Beovision 4002 consumed only 110 watts – less than a black and white set of years previously.

Both sets were extremely easy to use. There were facilities for presetting up to eight stations so that subsequent programme selection was just a matter of pressing one button. This turned the set on at the same time.

Beovision 4402 had the additional convenience of a cordless (ultrasonic) remote control. The set could also be supplied equipped for Teletext reception. There was automatic synchronisation of VCR programmes on all channels.

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BeoVision 3500

BeoVision 3500

Beovision 3500 type number: 3907 was a 56cm colour television designed by David Lewis and Henning Moldenhawer. It could be placed on two types of stand – the trumpet stand (shown above) and the cross foot stand.

By 1975, colour television had become commonplace in homes throughout Western Europe. And a lot of those homes were furnished in white – the ‘in’ colour of the 1970s. Television, as a lot of home furnishings, followed this trend and Beovision 3500, with its trumpet base and cross-base on wheels, reflected what was happening in the world of interior design. The cabinet was made of moulded plastic and its appearance was markedly different from most other televisions of the era.

Beovision 3500 was Bang & Olufsen’s first fully transistorised television; this meant that very little warm up time was necessary for picture and sound. The choice of television channels had increased considerably over the previous years and the controls were adapted accordingly. “In everyday use, you select your TV programmes using the easy-touch push buttons at the top. Each of these can be set to one TV channel; this is done once only using the scaled potentiometer dials. These eight dials are only visible when the panel is opened; this is where you or your dealer can set the VHF and UHF channels that you are able to receive. Beovision 3500 has automatic frequency control, AFC, which locks the TV stations once they have been selected.” said the sales literature in 1975.

With Beovision 3500 it was clear that an icon had been created. The cabinet was made of moulded plastic and its appearance was markedly different from most other televisions of the time. However, the wooden cabinet was retained in the similarly-styled Beovision 3600 model. From 1975, Bang & Olufsen was also able to equip all its televisions with Automatic Cut-off Control.

An invention by the young engineer Erik Albert Jensen made waves internationally in the television sector. Cut-off Control ensures that the colour balance is maintained throughout the service life of the television. No fewer than 50 times each second the three electron beams are measured and corrected independently, thus avoiding any annoying deviations in colour.

(Taken from Beolink Magazine: ‘The First 50 Years of Television’ © Bang & Olufsen a/s 2002)